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53-acre lake in Cochrane District, Ontario. The lake tops out around 24 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. What the data behind the map says about each species, season by season:
The outline encloses 53 acres, worked by 1.4 miles of shoreline. A shoreline index of 1.4 says round and simple: fish relate to depth changes here, not shoreline features. Littoral water — the productive band under ~15 ft — makes up 98% of this chart. Call it 0.5 mi long by 0.3 mi wide at the broadest reach. Cochrane District claims this one. If the bite dies, Pack Can Lake is 1 mi to the east.
When the water first warms, brook trout slide up into 2 to 15 ft. Summer is a 7 to 24 ft game here, winter a 3 to 20 ft one. Start at Deep basin. It's a deep basin holding about 19 ft of water and rates prime come summer. The feeding windows run early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 7 to 24 ft | dawn & dusk | Deep basin (19 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Deep basin (19 ft) | Small jigging spoon, Tungsten jig + plastic |
5 pieces of structure are mapped here — Deep basin, around 19 ft, is the deepest of them.
Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Dewhirst Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Dewhirst Lake is about 24 ft (7 m) deep at its deepest point. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target brook trout on Dewhirst Lake.
Deep basin is the top-rated area: a deep basin in about 19 ft of water that rates prime for brook trout in summer. The interactive chart above rates every spot for each species and season.
For brook trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Dewhirst Lake is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Pack Can Lake 1 mi · Pothole L.s 1 mi · Garrison L. 1 mi · Halfway Lake 1 mi · Clermont Lake 2 mi · Emens Lake 3 mi · Brinnie Lake 3 mi · Hewitt Lake 4 mi · Collins Lake 4 mi · Pike Lake 4 mi · Knight Lake 5 mi · McCulloch Lake 5 mi
See how Dewhirst Lake stacks up: best brook trout lakes in Ontario
More water nearby: Cochrane District fishing maps (673 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry: published agency survey data. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.